Some ways in which lack of energy supply affects societal development

Which is an example of gaining a static charge by conduction? a) rubbing a balloon against your hair. b) shuffling your shoes across a carpet. c) bringing a charged rod near an electroscope. d) touching your car on a cold day and getting a shock.

What object a collides with object b and bounces back its final momentum is?

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?